http://seattlecentral.edu/faculty/moneil/A210/L5/Lesson5-7ed.htm



package com.company;

import java.net.*;
import java.io.*;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.border.EmptyBorder;


class Host {

    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    Sender frame = new Sender();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });



        ServerSocket s = null;
        try {

            s = new ServerSocket(5555);
            Socket s1 = s.accept();
            OutputStream s1out = s1.getOutputStream();
            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s1out));
            bw.write("");
            bw.close();
            s1.close();

        }catch (Exception e){

            e.printStackTrace();
        }

    }

}

    class Sender extends JFrame implements ActionListener {

        private static final long serialVersionUID = 1L;

        private JPanel contentPane;
        private JTextField textField = new JTextField();


        private JButton btnSend = new JButton("Send");

        private String textFieldInput;
        private JButton[] myButtons =
                {btnSend};


        public Sender() {
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setBounds(100, 100, 450, 300);
            setSize(500, 400);
            setLocationRelativeTo(null);
            setResizable(false);

            contentPane = new JPanel();
            contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
            setContentPane(contentPane);
            contentPane.setLayout(null);

            positionTextField();
            positionButtons();

            for (JButton jButton : myButtons) {
                jButton.addActionListener(this);
                contentPane.add(jButton);
            }

        }

        public void positionTextField() {
            textField.setFont(new Font("Dialog", Font.PLAIN, 20));
            textField.setHorizontalAlignment(SwingConstants.CENTER);
            textField.setBounds(46, 12, 380, 42);
            contentPane.add(textField);
            textField.setColumns(10);
        }

        public void positionButtons() {

            btnSend.setBounds(180, 292, 150, 48);
        }

        public void setTextTo(String text) {
            textField.setText(textField.getText() + text);
            textField.requestFocus();
        }


        @Override
        public void actionPerformed(ActionEvent e) {
            if (e.getSource() == btnSend) {
                textField.setText(bw.write);
                textField.requestFocus();
            }

        }
    }